Some of the professionals participating in the project are doing so by avocation
amusement, diversion, pastime, recreation are synonyms for avocation.
An avocation is a hobby or occupation someone does in their free time.
Avocation is something one does in lieu of their regular work or vocation, such as a hobby. To use it in a sentence: "My profession as an accountant is very rewarding, but my true love is my avocation of woodworking and furniture construction." She started a dance group as an avocation but soon discovered she had a full scale business on her hands.
She started a dance group as an avocation but soon discovered she had a full scale business on her hands.A Web site is an avocation for me as I make my living at home writing about vacation marketing.
avocation
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Hobby
avocation
Avocation
A noun (as are almost all English words ending in -tion)
That is the correct spelling of the word "hobby" (a pastime or avocation).